Method of manufacturing lead sulfate.



B. Sx WHITE.

METHOD 0F MANuFACTuRlNG LEAD suLFATE.

APPLICATIGN FILED OCT, I6, 1915.

l,1 87,949. Patented June 20, 195;.

FII F l, lyMZfM/ dem,

UNITED STATES 'PATENTfoFmCE BERNAD S. WHITE, 0F JOPIN, MISSOURI, ASSIGNOR T0 PICHER-LED'C-OMPANY, i013" JOPLIN, MISSOURI, A CORPORATION 0F MIssoURI.

speification of Letters Parmi.

METHOD 0E MANUFACTURING LEAD SULFA'TE.

`I aeenteaJime2o, 1916.

Application tiled OctoberilG, 1915. Serial No.'56 ,220.

To all whom it may concern;

Be it known that I, BERNAnD S. Vx-u'r, a citizen of the United States, residing in Joplin. in the county of .lasper and State of Missouri, have invented certain new and use fnl .l'm.rovements 1n Methods of Manu;

facturing Lead Sulfate,v of -which the-fol :ind of :i fine state-of division from. litharge :is a vhasie. material and` my invention consistsin the process of forming` n vapor or t'unnof litharge hy blowing hot air over with said fume :und an excess of air and healing said mixed gases and fume to promote their rhen'ucnl union and the formation of n lead sulfate which Ais neutral on hasn: to :in v desired degree, in accordance with the proportion of sulturdii'rxid ,gas 'in the mixture.

Reference being had to the drawing which illustrates diagrarnmaticnlly un apparatusv uitahle for use. with my new process,l is a flue lending ft'rom a furnace. wherein lithilrgge is melted vand from which the turned:

lithnrge mixed with air and furnace gases passes to the. flue..

l is a (lue. leading from :i source olf-sulfur dioxid fns intothe. flue A.

(l is :Lhender into which the mixed gases pass und' from which they pass through tuin-s: ortlnes lTto the header C' and thence through (lue ill'. and suction fan to flue .T which delivers them through ports J to the hoxes K one only of which-is shown in the drawing. To the tops of the boxes K are connected screenhags l, which permit the gases to escape, the-screened sulfate falling into the hopper bottom K fof box K from which it is withdrawn from time to time.

The flues D` are inclosed in a casingr vE` which, :is shown, isheatei'internally byv gas hurners F connected to pipe 1". i

G is theescape'tlue (if easing E.

In making` neutral le'ad sulfate which consists of 7 3.60--per cent; of lead o xid and 26.50 per cent. of sulfate trio-xid there would theoretically he required 21.2'per cent.` of sulfur dioxid formed from v10.60 per cent. of sulfur` ln. practice. liowev'er-'there'must he a slight excess of sulfur d iojxid, vthat is Jo sny'there would h e required slightly more than 10.60 pounds of sulfur for cach 73.60 'I pounds of lead oxid"passin g to the eonihin ingftlues 'iu the, formioffiiined lithargre- \Vhere it ,is "desired to produce, al'iasie lend s'ul'fite it is oulyuecessary to supply the. lead oxidfumel igxcater' propp'itiouto the. sulfur dioxid:thanfivliere the'fnetral melted hthnrge.; mixing sulfur dioxid gas sta nee. v would hej'the formation .offa basic lead sulfate. egnitiunngf 1G per rent.' lead oxid and St per. rent. leid sul-fate. This' compound1 would -eontain 22.17 peivcent.

sulfur trioxid and 77.85?" per cent.. of lead oxid and in myproeess would theoretically requirel the forn'mtion of 17.73 per cent. of sulfur dioxid from 8.86 pounds of sulfur for 77.83 pounds of lead Oxid fume.. Tn

T claim as neu-'rand desire to secure.. hy Letters Patent is, A

l. The rnetlmdof nmnuliaeturluer lead sulfate which consists in converting ht'hargfe.

vinto :i .fume or vapor mixing with such litharge. fume, air and sulfur dioxid gas 'in q'uilntity in slight excess of that theoretically required to produce lead sulfate of the desired composition, and subjectingr the mixed .fume and gases to heat to insure the chemical umori of the compQne-nts and the formation afg leadsulfaig in :1V-*fine gtate of i division.' v u 2. 'The method of manufacturingbasic e'ad Sulfate which Aconsists' inconvcrtfing litlailge. into a" fume orvvapor, mixing'wth su ziigfiitl-iarge fu'me,` ir and sulfur 'doxid gas in quantity lto prodiice. a basic lead sulfate of the desired compositioxifandsub- .jecting the mixed fume 'and gases to heat to insurfqthe chemical linn'of the'tfompo` ments and tha formation of a basic lead sulfate in a fine state of 'division4 BERNARD S. WHITxfzi 

